import java.io.IOException;
import java.util.Scanner;
public class MyDCTest {
    public static void main(String[] args) {
        String expression, again;
        int result;
        try {
            Scanner in = new Scanner(System.in);
            do {
                MyDC evaluator = new MyDC();
                System.out.println("Enter a valid postfix expression: ");
                expression = in.nextLine();
                result = evaluator.evaluate(expression);
                System.out.println();
                System.out.println("That expression equals " + result);
                System.out.print("Evaluate another expression [Y/N]? ");
                again = in.nextLine();
                System.out.println();
            } while (again.equalsIgnoreCase("y"));
        } catch (Exception IOException) {
            System.out.println("Input exception reported");
        }
    }
}